More info than you need. If I were only as interested in my job as rifles...
- It's a sporterized 1891 Argentine Mauser in 7.65*54. This caliber is also known as 7.65 Belgian or Turkish Mauser. The Turks were quite crafty, and wrote into their contracts that they could immediately benefit from technological advances as they developed, so they wouldn't be left (like other nations) with a bunch of 'newly obsolete" guns still being produced out of long term contracts. Thus, they went to 8mm shortly after it's appearance.
- DWM was the second factory that produced them, as Ludwig Lowe was the 1st. ALL Lowe guns are antiques as if memory serves me correctly, they were produced from 91-96. DWM produced them from '96 -? (perhaps '09), and thus this one may not be antique.
- The '91 mauser action is not as strong as the typical 3 lug mauser '98 action, but it worked fine for the ORIGINAL variation of 7.65 Argie. In 1909, Argentina along with most other nations, upgraded their cartridge, and it became the 'bala SS 1909' Ths cartridge is very close in size and performance to the 7.62*51 NATO which followed decades later. It's hotter than the original loading. It's probably a little too powerful for the M91, but I'm not aware of burst guns, and you know that they've fired millions of rounds through tens of thousands of rifles over the decades.
- It was replaced by the most finely made rifle ever to come out of Mauser in military trim, the Modelo 1909, which was made from '09 through '14, the start of WWI. Which for the record, is in the same 7.65 caliber.
- They are not worth a whole lot in the first place, and a sporterized one is just about worthless.